This is a map of every school shooting since Sandy Hook

On Dec. 14, 2012, Adam Lanza shot and killed 26 people — including 20 children — at Sandy Hook Elementary, in Connecticut.

The tragedy refueled the ongoing debate about gun control and gun rights in the United States: What kinds of guns should be illegal? Should any? What kinds of people should not have access to guns? Should felons or those convicted of drug- or domestic abuse-related crimes be barred? What should be required to purchase a gun?

Not a single major piece of gun-related legislation has been passed at the national level since Sandy Hook.

There have been 44 school shootings.

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A report issued earlier this month by the advocacy groups Mayors Against Illegal Guns and Moms Demand Action explains that number: "Incidents were classified as school shootings when a firearm was discharged inside a school building or on school or campus grounds, as documented in publicly reported news accounts."

Twenty eight people died in these shootings: 19 homicides and nine suicides. The youngest shooter was 5; the oldest, 53. "Among those shootings where it was possible to determine the source of the firearm, three-quarters of the shooters obtained their guns from home," according to the report.

More than half of the 44 shootings, 23, occurred in Southern states — including three in Georgia.

From the report again: "In the first six weeks of 2014 alone, there were 13 school shootings including one eight-day period in which there were four shootings in K-12 schools."